---

yaml
---
r: 54951
b: refs/heads/master
c: 38a3dc5
h: refs/heads/master
i:
  54949: e335351
  54947: cdcab7e
  54943: e22d4b7
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e15de77e74d429f14641ebe7a29ccd8aa6656f3c
+refs/heads/master: 38a3dc51852d8350b156ea909c5aa8767d71b005

trunk/drivers/video/console/fbcon.c

@@ -3043,13 +3043,51 @@ static void fbcon_new_modelist(struct fb_info *info)
 	}
 }
 
+static void fbcon_get_requirement(struct fb_info *info,
+				  struct fb_blit_caps *caps)
+{
+	struct vc_data *vc;
+	struct display *p;
+	int charcnt;
+
+	if (caps->flags) {
+		int i;
+
+		for (i = first_fb_vc; i <= last_fb_vc; i++) {
+			vc = vc_cons[i].d;
+			if (vc && vc->vc_mode == KD_TEXT) {
+				p = &fb_display[i];
+				caps->x |= 1 << (vc->vc_font.width - 1);
+				caps->y |= 1 << (vc->vc_font.height - 1);
+				charcnt = (p->userfont) ?
+					FNTCHARCNT(p->fontdata) : 256;
+				if (caps->len < charcnt)
+					caps->len = charcnt;
+			}
+		}
+	} else {
+		vc = vc_cons[fg_console].d;
+
+		if (vc && vc->vc_mode == KD_TEXT) {
+			p = &fb_display[fg_console];
+			caps->x |= 1 << (vc->vc_font.width - 1);
+			caps->y |= 1 << (vc->vc_font.height - 1);
+			charcnt = (p->userfont) ?
+				FNTCHARCNT(p->fontdata) : 256;
+			if (caps->len < charcnt)
+				caps->len = charcnt;
+		}
+	}
+}
+
 static int fbcon_event_notify(struct notifier_block *self, 
 			      unsigned long action, void *data)
 {
 	struct fb_event *event = data;
 	struct fb_info *info = event->info;
 	struct fb_videomode *mode;
 	struct fb_con2fbmap *con2fb;
+	struct fb_blit_caps *caps;
 	int ret = 0;
 
 	/*
@@ -3098,6 +3136,10 @@ static int fbcon_event_notify(struct notifier_block *self,
 	case FB_EVENT_NEW_MODELIST:
 		fbcon_new_modelist(info);
 		break;
+	case FB_EVENT_GET_REQ:
+		caps = event->data;
+		fbcon_get_requirement(info, caps);
+		break;
 	}
 
 done:

trunk/drivers/video/fbmem.c

@@ -773,6 +773,29 @@ fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
         return 0;
 }
 
+static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
+			 u32 activate)
+{
+	struct fb_event event;
+	struct fb_blit_caps caps, fbcaps;
+	int err = 0;
+
+	memset(&caps, 0, sizeof(caps));
+	memset(&fbcaps, 0, sizeof(fbcaps));
+	caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
+	event.info = info;
+	event.data = ∩︀
+	fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
+	info->fbops->fb_get_caps(info, &fbcaps, var);
+
+	if (((fbcaps.x ^ caps.x) & caps.x) ||
+	    ((fbcaps.y ^ caps.y) & caps.y) ||
+	    (fbcaps.len < caps.len))
+		err = -EINVAL;
+
+	return err;
+}
+
 int
 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 {
@@ -817,7 +840,15 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 			struct fb_videomode mode;
 			int err = 0;
 
+			if (info->fbops->fb_get_caps) {
+				err = fb_check_caps(info, var, activate);
+
+				if (err)
+					goto done;
+			}
+
 			info->var = *var;
+
 			if (info->fbops->fb_set_par)
 				info->fbops->fb_set_par(info);
 
@@ -843,6 +874,8 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 			}
 		}
 	}
+
+ done:
 	return 0;
 }
 

trunk/include/linux/fb.h

@@ -527,12 +527,20 @@ struct fb_cursor_user {
 #define FB_EVENT_MODE_CHANGE_ALL	0x0B
 /*	A software display blank change occured */
 #define FB_EVENT_CONBLANK               0x0C
+/*      Get drawing requirements        */
+#define FB_EVENT_GET_REQ                0x0D
 
 struct fb_event {
 	struct fb_info *info;
 	void *data;
 };
 
+struct fb_blit_caps {
+	u32 x;
+	u32 y;
+	u32 len;
+	u32 flags;
+};
 
 extern int fb_register_client(struct notifier_block *nb);
 extern int fb_unregister_client(struct notifier_block *nb);
@@ -652,6 +660,10 @@ struct fb_ops {
 
 	/* restore saved state */
 	void (*fb_restore_state)(struct fb_info *info);
+
+	/* get capability given var */
+	void (*fb_get_caps)(struct fb_info *info, struct fb_blit_caps *caps,
+			    struct fb_var_screeninfo *var);
 };
 
 #ifdef CONFIG_FB_TILEBLITTING